GB1219985A - Improvements in or relating to methods of electronic colour correction - Google Patents
Improvements in or relating to methods of electronic colour correctionInfo
- Publication number
- GB1219985A GB1219985A GB02837/68A GB1283768A GB1219985A GB 1219985 A GB1219985 A GB 1219985A GB 02837/68 A GB02837/68 A GB 02837/68A GB 1283768 A GB1283768 A GB 1283768A GB 1219985 A GB1219985 A GB 1219985A
- Authority
- GB
- United Kingdom
- Prior art keywords
- function
- signal
- colour
- colour separation
- correction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Image Communication Systems (AREA)
- Facsimile Image Signal Circuits (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Image Analysis (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1,219,985. Electronic colour correction. DR.-ING RUDOLF HELL. 15 March, 1968 [22 March, 1967], No. 12837/68. Heading H4F. Relates to a method of electronic colour correction in which a secondary correction signal which disappears for grey tones is formed by subtracting an uncorrected primary colour separation signal (proportional to the original to be reproduced) from another colour correction information signal of the same grey contrast which is a primary colour separation signal or a linear mixture of two primary colour separation signals, and in which the uncorrected primary colour separation signal to which the secondary correction signal is added is first transformed according to a non- linear function which is an intermediate function between a linear and a logarithmic function, the form of which in the region between 100% and 1% of the primary colour separation signal value for the original colour white is represented by a power function y = x<SP>a</SP> with 0À3#a#0À6. The function according to which the colour separation signal is transformed is a Munsell function, i.e. a function of like physiological differences of perception. Each transferred primary colour separation signal may have a corresponding (i.e. associated) secondary signal added thereto.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEH0062217 | 1967-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1219985A true GB1219985A (en) | 1971-01-20 |
Family
ID=7161773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB02837/68A Expired GB1219985A (en) | 1967-03-22 | 1968-03-15 | Improvements in or relating to methods of electronic colour correction |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3590142A (en) |
| JP (1) | JPS5111452B1 (en) |
| DE (1) | DE1522488C3 (en) |
| FR (1) | FR1575630A (en) |
| GB (1) | GB1219985A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2607623B2 (en) * | 1976-02-25 | 1978-12-21 | Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel | Color evaluation device |
| GB8722406D0 (en) * | 1987-09-23 | 1987-10-28 | Crosfield Electronics Ltd | Reproduction of coloured images |
| US6330078B1 (en) * | 1998-12-09 | 2001-12-11 | Xerox Corporation | Feedback method and apparatus for printing calibration |
| US6842266B1 (en) * | 2000-02-25 | 2005-01-11 | Xerox Corporation | Systems and methods that determine an image processing system tone reproduction curve |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3124036A (en) * | 1964-03-10 | Method and apparatus for multicolor printing | ||
| US2721892A (en) * | 1951-06-27 | 1955-10-25 | Eastman Kodak Co | Variable electrooptical color correction |
| US2790844A (en) * | 1954-05-11 | 1957-04-30 | Adalia Ltd | Color correction selector |
| US2981792A (en) * | 1957-10-31 | 1961-04-25 | Fairchild Camera Instr Co | Color correction computer for engraving machines |
-
1967
- 1967-03-22 DE DE1522488A patent/DE1522488C3/en not_active Expired
-
1968
- 1968-03-15 GB GB02837/68A patent/GB1219985A/en not_active Expired
- 1968-03-21 US US715040A patent/US3590142A/en not_active Expired - Lifetime
- 1968-03-22 FR FR1575630D patent/FR1575630A/fr not_active Expired
- 1968-03-22 JP JP43018766A patent/JPS5111452B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1522488C3 (en) | 1974-09-26 |
| DE1522488B2 (en) | 1974-02-28 |
| US3590142A (en) | 1971-06-29 |
| FR1575630A (en) | 1969-07-25 |
| DE1522488A1 (en) | 1969-08-28 |
| JPS5111452B1 (en) | 1976-04-12 |
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